WO2022154477A1 - Équipement utilisateur pour accès aléatoire et procédé associé, station de base pour accès aléatoire et procédé associé - Google Patents

Équipement utilisateur pour accès aléatoire et procédé associé, station de base pour accès aléatoire et procédé associé Download PDF

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Publication number
WO2022154477A1
WO2022154477A1 PCT/KR2022/000560 KR2022000560W WO2022154477A1 WO 2022154477 A1 WO2022154477 A1 WO 2022154477A1 KR 2022000560 W KR2022000560 W KR 2022000560W WO 2022154477 A1 WO2022154477 A1 WO 2022154477A1
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WO
WIPO (PCT)
Prior art keywords
random access
subcarrier spacing
determining
access resource
index
Prior art date
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PCT/KR2022/000560
Other languages
English (en)
Inventor
Qi XIONG
Min Wu
Yi Wang
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Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN202110893364.7A external-priority patent/CN114765883A/zh
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to KR1020237021506A priority Critical patent/KR20230129400A9/ko
Priority to EP22739672.8A priority patent/EP4256887A4/fr
Publication of WO2022154477A1 publication Critical patent/WO2022154477A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/26025—Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0838—Random access procedures, e.g. with 4-step access using contention-free random access [CFRA]

Definitions

  • the present disclosure relates to a field of wireless communication technology, and in particular, to a user equipment for random access and method thereof, and a base station for random access and method thereof.
  • 5G or pre-5G communication systems are also called “Beyond 4G networks” or “Post-LTE systems”.
  • 5G communication systems are implemented in higher frequency (millimeter, mmWave) bands, e.g., 60 GHz bands.
  • technologies such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming and large-scale antenna are discussed in 5G communication systems.
  • FQAM FSK and QAM modulation
  • SWSC sliding window superposition coding
  • ACM advanced coding modulation
  • FBMC filter bank multicarrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • a random access method for a user equipment comprising: acquiring random access resource configuration information; determining a subcarrier spacing of the random access preamble; determining a random access occasion (RO) according to the random access resource configuration information and the subcarrier spacing of the random access preamble; and transmitting the random access preambles on the determined RO.
  • UE user equipment
  • the determining the subcarrier spacing of the random access preamble may comprise one of: determining the subcarrier spacing of the random access preamble according to an indication for the subcarrier spacing of the random access preamble received via a higher layer signalling or a physical layer message; or determining the subcarrier spacing of the random access preamble according to a value of subcarrier spacing at a frequency position where the UE is located.
  • the determining the subcarrier spacing of the random access preamble may comprise: if no indication for the subcarrier spacing of the random access preamble is received, the subcarrier spacing of the random access preamble is determined according to a value of subcarrier spacing at a frequency position where the UE is located.
  • the determining a random access occasion (RO) according to the random access resource configuration information and the subcarrier spacing of the random access preamble may comprise at least one of: determining corresponding random access resource according to random access configuration index in the random access resource configuration information and determining the RO according to the random access resource, when the determined subcarrier spacing of the random access preamble is a first subcarrier spacing; or, determining one or more slot groups containing the random access resource and determining the configured RO according to the random access configuration index in the random access resource configuration information based on the determined one or more slot groups, when the determined subcarrier spacing of the random access preamble is a second subcarrier spacing, wherein the configured RO in each of the multiple slot groups is same, and wherein the second subcarrier spacing is greater than the first subcarrier spacing.
  • RO random access occasion
  • the determining one or more slot groups containing the random access resource may comprise at least one of: determining the one or more slot groups containing the random access resource according to an acquired bitmap indicating the slot groups containing the random access resource; determining the one or more slot groups containing the random access resource by looking up a table according to an acquired index indication, wherein the index indication is used to indicate the one or more slot groups containing the random access resource; or, determining the one or more slot groups containing the random access resource according to a position of the first slot group having the random access resource, a number of the slot groups containing the random access resource, a position relationship and an deduction direction among the slot groups containing the random access resource.
  • the determining the RO when the determined subcarrier spacing of the random access preamble is a second subcarrier spacing may comprise: acquiring an indication for a position of a duration T_rachduration occupied by configured random access resource in a configured random access resource configuration period T_rachperiodicity; determining the position of T_rachduration in T_rachperiodicity according to the acquired indication for the position; and determining the RO according to the random access configuration index in the random access resource configuration information, based on the position of T_rachduration in T_rachperiodicity.
  • the determining the position of T_rachduration in T_rachperiodicity according to the acquired indication for the position may comprise: determining a position of the T_rachduration in the random access resource configuration period according to a configured N_rachduration_index, wherein N_rachduration_index is a position index for the T_rachduration in one configured T_rachperiodicity.
  • the determining the RO may further comprise determining that the RO is available and/or determining that the RO is valid, wherein the determining that the RO is available may comprise at least one of: determining that the available RO is a RO with odd index, A RO with even index or every nth RO, n is a positive integer; determining the available ROs according to a bit map for the available ROs; determining the available ROs according to a configured gap value between the available ROs; wherein the determining that the RO is valid may comprise at least one of: determining the valid ROs according to a configured gap value between the valid ROs; determining the valid ROs by comparing the ROs with a configured invalid pattern; or determining the valid ROs according to deciding start position for the valid ROs.
  • a random access apparatus for a user equipment (UE), comprising: a transceiver; and a controller configured to control the transceiver to receive random access resource configuration information; determine a subcarrier spacing of a random access preamble; determine a random access occasion RO according to the random access resource configuration information and the subcarrier spacing of the random access preamble; and transmit the random access preamble on the determined RO.
  • UE user equipment
  • the determining the subcarrier spacing of the random access preamble may comprise one of: determining the subcarrier spacing of the random access preamble according to an indication for the subcarrier spacing of the random access preamble received via a higher layer signalling or a physical layer message; or determining the subcarrier spacing of the random access preamble according to a value of subcarrier spacing at a frequency position where the UE is located.
  • the determining the subcarrier spacing of the random access preamble may comprise: if no indication for the subcarrier spacing of the random access preamble is received, the subcarrier spacing of the random access preamble is determined according to a value of subcarrier spacing at a frequency position where the UE is located.
  • the determining a random access occasion RO according to the random access resource configuration information and the subcarrier spacing of the random access preamble may comprise at least one of: determining corresponding random access resource according to random access configuration index in the random access resource configuration information and determining the RO according to the random access resource, when the determined subcarrier spacing of the random access preamble is a first subcarrier spacing; or, determining one or more slot groups containing the random access resource and determining the configured RO according to the random access configuration index in the random access resource configuration information based on the determined one or more slot groups, when the determined subcarrier spacing of the random access preamble is a second subcarrier spacing, wherein the configured RO in each of the multiple slot groups is the same, and wherein the second subcarrier spacing is greater than the first subcarrier spacing.
  • the determining one or more slot groups containing the random access resource may comprise at least one of: determining the one or more slot groups containing the random access resource according to an acquired bitmap indicating the slot groups containing the random access resource; determining the one or more slot groups containing the random access resource by looking up a table according to an acquired index indication, wherein the index indication is used to indicate the one or more slot groups containing the random access resource; or, determining the one or more slot groups containing the random access resource according to a position of the first slot group having the random access resource, a number of the slot groups containing the random access resource, a position relationship and an deduction direction between the slot groups containing the random access resource.
  • the determining a random access occasion RO according to the random access resource configuration information and the subcarrier spacing of the random access preamble may further comprise: determining a RO of a first subcarrier spacing according to the random access resource configuration information; and determining a RO of a second subcarrier spacing corresponding to the RO of the first subcarrier spacing according to the RO of the first subcarrier spacing, wherein the second subcarrier spacing is N times the first subcarrier spacing.
  • the determining a RO of a second subcarrier spacing corresponding to the RO of the first subcarrier spacing according to the RO of the first subcarrier spacing may comprise at least one of: determining, in a time length of N ROs of the second subcarrier spacing corresponding to a time length of RO of the first subcarrier spacing, all ROs are configured to ROs of the second subcarrier spacing; receiving a RO configuration transmitted from the base station; and determining the RO of the second subcarrier spacing corresponding to the RO of the first subcarrier spacing according to the RO configuration.
  • the RO configuration comprises a bitmap for the RO of the second subcarrier spacing corresponding to the RO of the first subcarrier spacing.
  • the RO configuration comprises an odd RO index, an even RO index, or every nth RO index.
  • the RO of the second subcarrier spacing corresponding to the RO of the first subcarrier spacing is determined according to the RO configuration.
  • the RO configuration comprises a reference RO index and a number of ROs.
  • the reference RO index may be an index of the first RO or an index of the last RO.
  • the RO of the second subcarrier spacing corresponding to the RO of the first subcarrier spacing is determined according to the RO configuration and a default or configured deduction direction.
  • the determining the RO when the determined subcarrier spacing of the random access preamble is a second subcarrier spacing may comprise: acquiring an indication for a position of a duration T_rachduration occupied by configured random access resource in a configured random access resource configuration period T_rachperiodicity; determining the position of T_rachduration in T_rachperiodicity according to the acquired indication for the position; and determining the RO according to the random access configuration index in the random access resource configuration information, based on the position of T_rachduration in T_rachperiodicity.
  • the determining the position of T_rachduration in T_rachperiodicity according to the acquired indication for the position may comprise: determining a position of the T_rachduration in the random access resource configuration period bearing the random access resource according to a configured N_rachduration_index, wherein N_rachduration_index is a position index for the T_rachduration in one configured T_rachperiodicity.
  • Determining the RO may further comprise determining that the RO is available and/or determining that the RO is valid, wherein the determining that the RO is available may comprise at least one of: determining that the available RO is an RO with an odd index, an RO with even index or every nth RO, n is a positive integer, according to a configured available RO index; determining the available RO according to a configured gap value of the available RO; wherein the determining that the RO is valid may comprise at least one of: determining a valid RO according to a configured gap value of the valid ROs; determining a valid RO by comparing the RO with a configured invalid pattern; or determining a valid RO according to deciding a start position for the valid RO.
  • a random access method for a base station comprising: transmitting random access resource configuration information to a user equipment (UE).
  • UE user equipment
  • the random access method for the base station may further comprise: transmitting, to the user equipment (UE), an indication for a subcarrier spacing of a random access preamble, wherein a random access resource configuration information and a subcarrier spacing of the random access preamble are used to determine a random access occasion (RO) by the UE.
  • UE user equipment
  • a random access apparatus for a base station, comprising: a transceiver; and a controller configured to control the transceiver to transmit random access resource configuration information to a user equipment (UE).
  • UE user equipment
  • the controller may further be configured to transmit to the UE, an indication for a subcarrier spacing of the random access preamble, wherein a random access resource configuration information and a subcarrier spacing of the random access preamble are used to determine a random access occasion (RO) by the UE.
  • RO random access occasion
  • various functions described below can be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium.
  • application and “program” refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in a suitable computer readable program code.
  • computer readable program code includes any type of computer code, including source code, object code, and executable code.
  • computer readable medium includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory.
  • ROM read only memory
  • RAM random access memory
  • CD compact disc
  • DVD digital video disc
  • a "non-transitory” computer readable medium excludes wired, wireless, optical, or other communication links that transport transitory electrical or other signals.
  • a non-transitory computer readable medium includes media where data can be permanently stored and media where data can be stored and later overwritten, such as a rewritable optical disc or an erasable memory device.
  • Performance of random access can be improved by determining the corresponding random access resource with the subcarrier spacing of the random access preamble.
  • FIG.1 illustrates an example wireless network according to various embodiments of the present disclosure
  • FIG. 2a illustrates an example wireless transmission and reception paths according to the present disclosure
  • FIG. 2b illustrates an example wireless transmission and reception paths according to the present disclosure
  • FIG. 3a illustrates a structure view for an example UE according to the present disclosure
  • FIG. 3b illustrates a structure view for an example base station according to the present disclosure
  • FIG. 4 illustrates a schematic view for a random access process based on contention between a UE and a base station in the LTE-A according to an embodiment of the present disclosure
  • FIG. 5 illustrates a flowchart of a random access method of a UE according to an embodiment of the present disclosure
  • FIG. 6 illustrates a view of an example of random access resource configuration in case that a subcarrier spacing on PRACH is 120kHz, according to an embodiment of the present disclosure
  • FIG. 7 illustrates a view of an example for acquiring of a random access configuration by a bitmap indication according to an embodiment of the present disclosure
  • FIG. 8 illustrates a schematic view of a UE according to an embodiment of the present disclosure
  • FIG. 9 illustrates a schematic view of a base station according to an embodiment of the present disclosure.
  • FIG. 10 illustrates a view of an example of a RO indication method for a second subcarrier spacing according to an embodiment of the present disclosure.
  • FIG. 11 illustrates a view of an example of SDT preamble configuration according to an embodiment of the present disclosure.
  • FIGS. 1 through 11, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged system or device
  • terminal and terminal equipment used here include both the equipment of wireless signal receiver, which only has the equipment of wireless signal receiver without transmitting capability, and the equipment for receiving and transmitting hardware, which has the equipment of receiving and transmitting hardware capable of two-way communication on the two-way communication link.
  • Such a device may include: a cellular or other communication device having a single line display or a multi-line display or a cellular or other communication device without a multi-line display; PCS (Personal Communications Service), which can combine voice, data processing, fax and/or data communication capabilities; PDA (Personal Digital Assistant), which can include RF receiver, pager, Internet/intranet access, web browser, Notepad, calendar and/or GPS (Global Positioning System) receiver; a conventional laptop and/or handheld computer or other device having and/or including a RF receiver.
  • PCS Personal Communications Service
  • PDA Personal Digital Assistant
  • RF receiver pager, Internet/intranet access, web browser, Notepad, calendar and/or GPS (Global Positioning System) receiver
  • GPS Global Positioning System
  • terminal and terminal equipment used herein may be portable, transportable, installed in vehicles (aviation, marine and/or land), or suitable and/or configured to operate locally, and/or in a distributed form, in any other location on earth and/or space.
  • the "terminal” and “terminal device” used here can also be a communication terminal, an internet terminal and a music/video playback terminal, for example, PDA, MID (Mobile Internet Device) and/or a mobile phone with music/video playback function, as well as smart TV, set-top box and other devices.
  • a time domain unit (also known as a time unit) in the present disclosure may be: one OFDM symbol, one OFDM symbol group (composed of multiple OFDM symbols), a slot, a slot group (composed of multiple slots), one subframe, one subframe group (composed of multiple subframes), one system frame and one system frame group (composed of multiple system frames). It may also be an absolute time unit, such as 1 millisecond, 1 second, etc.
  • the time unit may also be a combination of multiple granularity, for example, may be N1 slots plus N2 OFDM symbols.
  • a frequency domain unit in the present disclosure may be: one subcarrier, one subcarrier group (composed of multiple subcarriers), one resource block (RB), also known as physical resource block (PRB), one resource block group (composed of multiple RBs), one bandwidth part (BWP), one bandwidth part group (composed of multiple BWPs) , one band/carrier, one band group/carrier group. It may also be an absolute frequency domain unit, such as 1 Hz, 1 kHz, etc. The frequency domain unit may also be a combination of multiple granularity, for example may be M1 PRBs plus M2 subcarriers.
  • RRC radio resource control
  • SCS Sub-Carrier Spacing
  • whether the signal could be transmitted may be related to a result of channel condition detection (for example, performing a listen before talk (LBT) operation on the channel, that is, monitoring the channel at first, and transmitting the signal if the channel is idle; and no signal is transmitted if the channel is busy). Therefore, it is necessary to provide a random access method in the unlicensed spectrum system. For example, in the unlicensed spectrum system, how to configure random access resource and how UE obtains and determines an available random access resource configuration are problems to be solved.
  • LBT listen before talk
  • the present disclosure provides the following embodiments.
  • FIG. 1 illustrates an example wireless network 100 according to various embodiments of the present disclosure.
  • the embodiment of the wireless network 100 shown in FIG. 1 is for illustration only. Other embodiments of the wireless network 100 can be used without departing from the scope of the present disclosure.
  • the wireless network 100 includes a gNodeB (gNB) 101, a gNB 102, and a gNB 103.
  • gNB 101 communicates with gNB 102 and gNB 103.
  • gNB 101 also communicates with at least one Internet Protocol (IP) network 130, such as the Internet, a private IP network, or other data networks.
  • IP Internet Protocol
  • gNodeB base station
  • access point can be used instead of “gNodeB” or “gNB”.
  • gNodeB and gNB are used in this patent document to refer to network infrastructure components that provide wireless access for remote terminals.
  • other well-known terms such as “mobile station”, “user station”, “remote terminal”, “wireless terminal” or “user apparatus” can be used instead of “user equipment” or “UE”.
  • the terms "user equipment” and "UE” are used in this patent document to refer to remote wireless devices that wirelessly access the gNB, no matter whether the UE is a mobile device (such as a mobile phone or a smart phone) or a fixed device (such as a desktop computer or a vending machine).
  • the gNB 102 provides wireless broadband access to the network 130 for a first plurality of User Equipments (UEs) within a coverage area 120 of gNB 102.
  • the first plurality of UEs include a UE 111, which may be located in a Small Business (SB); a UE 112, which may be located in an enterprise (E); a UE 113, which may be located in a WiFi Hotspot (HS); a UE 114, which may be located in a first residence (R); a UE 115, which may be located in a second residence (R); a UE 116, which may be a mobile device (M), such as a cellular phone, a wireless laptop computer, a wireless PDA, etc.
  • M mobile device
  • GNB 103 provides wireless broadband access to network 130 for a second plurality of UEs within a coverage area 125 of gNB 103.
  • the second plurality of UEs include a UE 115 and a UE 116.
  • one or more of gNBs 101-103 can communicate with each other and with UEs 111-116 using 5G, Long Term Evolution (LTE), LTE-A, WiMAX or other advanced wireless communication technologies.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-A
  • WiMAX Worldwide Interoperability for Microwave Access
  • the dashed lines show approximate ranges of the coverage areas 120 and 125, and the ranges are shown as approximate circles merely for illustration and explanation purposes. It should be clearly understood that the coverage areas associated with the gNBs, such as the coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on configurations of the gNBs and changes in the radio environment associated with natural obstacles and man-made obstacles.
  • one or more of gNB 101, gNB 102, and gNB 103 include a 2D antenna array as described in embodiments of the present disclosure.
  • one or more of gNB 101, gNB 102, and gNB 103 support codebook designs and structures for systems with 2D antenna arrays.
  • the wireless network 100 can include any number of gNBs and any number of UEs in any suitable arrangement, for example.
  • gNB 101 can directly communicate with any number of UEs and provide wireless broadband access to the network 130 for those UEs.
  • each gNB 102-103 can directly communicate with the network 130 and provide direct wireless broadband access to the network 130 for the UEs.
  • gNB 101, 102 and/or 103 can provide access to other or additional external networks, such as external telephone networks or other types of data networks.
  • FIGs. 2a and 2b illustrate example wireless transmission and reception paths according to the present disclosure.
  • the transmission path 200 can be described as being implemented in a gNB, such as gNB 102
  • the reception path 250 can be described as being implemented in a UE, such as UE 116.
  • the reception path 250 can be implemented in a gNB and the transmission path 200 can be implemented in a UE.
  • the reception path 250 is configured to support codebook designs and structures for systems with 2D antenna arrays as described in embodiments of the present disclosure.
  • the transmission path 200 includes a channel coding and modulation block 205, a Serial-to-Parallel (S-to-P) block 210, a size N Inverse Fast Fourier Transform (IFFT) block 215, a Parallel-to-Serial (P-to-S) block 220, a cyclic prefix addition block 225, and an up-converter (UC) 230.
  • S-to-P Serial-to-Parallel
  • IFFT Inverse Fast Fourier Transform
  • P-to-S Parallel-to-Serial
  • UC up-converter
  • the reception path 250 includes a down-converter (DC) 255, a cyclic prefix removal block 260, a Serial-to-Parallel (S-to-P) block 265, a size N Fast Fourier Transform (FFT) block 270, a Parallel-to-Serial (P-to-S) block 275, and a channel decoding and demodulation block 280.
  • DC down-converter
  • S-to-P Serial-to-Parallel
  • FFT Fast Fourier Transform
  • P-to-S Parallel-to-Serial
  • the channel coding and modulation block 205 receives a set of information bits, applies coding (such as Low Density Parity Check (LDPC) coding), and modulates the input bits (such as using Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM)) to generate a sequence of frequency-domain modulated symbols.
  • coding such as Low Density Parity Check (LDPC) coding
  • QPSK Quadrature Phase Shift Keying
  • QAM Quadrature Amplitude Modulation
  • the Serial-to-P) block 210 converts (such as demultiplexes) serial modulated symbols into parallel data to generate N parallel symbol streams, where N is a size of the IFFT/FFT used in gNB 102 and UE 116.
  • the size N IFFT block 215 performs IFFT operations on the N parallel symbol streams to generate a time-domain output signal.
  • the Parallel-to-Serial block 220 converts (such as multiplexes) parallel time-domain output symbols from the Size N IFFT block 215 to generate a serial time-domain signal.
  • the cyclic prefix addition block 225 inserts a cyclic prefix into the time-domain signal.
  • the up-converter 230 modulates (such as up-converts) the output of the cyclic prefix addition block 225 to an RF frequency for transmission via a wireless channel.
  • the signal can also be filtered at a baseband before switching to the RF frequency.
  • the RF signal transmitted from gNB 102 arrives at UE 116 after passing through the wireless channel, and operations in reverse to those at gNB 102 are performed at UE 116.
  • the down-converter 255 down-converts the received signal to a baseband frequency
  • the cyclic prefix removal block 260 removes the cyclic prefix to generate a serial time-domain baseband signal.
  • the Serial-to-Parallel block 265 converts the time-domain baseband signal into a parallel time-domain signal.
  • the Size N FFT block 270 performs an FFT algorithm to generate N parallel frequency-domain signals.
  • the Parallel-to-Serial block 275 converts the parallel frequency-domain signal into a sequence of modulated data symbols.
  • the channel decoding and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.
  • Each of gNBs 101-103 may implement a transmission path 200 similar to that for transmitting to UEs 111-116 in the downlink, and may implement a reception path 250 similar to that for receiving from UEs 111-116 in the uplink.
  • each of UEs 111-116 may implement a transmission path 200 for transmitting to gNBs 101-103 in the uplink, and may implement a reception path 250 for receiving from gNBs 101-103 in the downlink.
  • Each of the components in FIGs. 2a and 2b can be implemented using only hardware, or using a combination of hardware and software/firmware.
  • at least some of the components in FIGs. 2a and 2b may be implemented in software, while other components may be implemented in configurable hardware or a combination of software and configurable hardware.
  • the FFT block 270 and IFFT block 215 may be implemented as configurable software algorithms, in which the value of the size N may be modified according to the implementation.
  • variable N may be any integer (such as 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of variable N may be any integer which is a power of 2 (such as 1, 2, 4, 8, 16, etc.).
  • FIGs. 2a and 2b illustrate examples of wireless transmission and reception paths
  • various changes may be made to FIGs. 2a and 2b.
  • various components in FIGs. 2a and 2b can be combined, further subdivided or omitted, and additional components can be added according to specific requirements.
  • FIGs. 2a and 2b are intended to illustrate examples of types of transmission and reception paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communication in a wireless network.
  • FIG. 3a illustrates an example UE 116 according to the present disclosure.
  • the embodiment of UE 116 shown in FIG. 3a is for illustration only, and UEs 111-115 of FIG. 1 can have the same or similar configuration.
  • a UE has various configurations, and FIG. 3a does not limit the scope of the present disclosure to any specific implementation of the UE.
  • UE 116 includes an antenna 305, a radio frequency (RF) transceiver 310, a transmission (TX) processing circuit 315, a microphone 320, and a reception (RX) processing circuit 325.
  • UE 116 also includes a speaker 330, a processor/controller 340, an input/output (I/O) interface 345, an input device(s) 350, a display 355, and a memory 360.
  • the memory 360 includes an operating system (OS) 361 and one or more applications 362.
  • OS operating system
  • applications 362 one or more applications
  • the RF transceiver 310 receives an incoming RF signal transmitted by a gNB of the wireless network 100 from the antenna 305.
  • the RF transceiver 310 down-converts the incoming RF signal to generate an intermediate frequency (IF) or baseband signal.
  • the IF or baseband signal is transmitted to the RX processing circuit 325, where the RX processing circuit 325 generates a processed baseband signal by filtering, decoding and/or digitizing the baseband or IF signal.
  • the RX processing circuit 325 transmits the processed baseband signal to speaker 330 (such as for voice data) or to processor/controller 340 for further processing (such as for web browsing data).
  • the TX processing circuit 315 receives analog or digital voice data from microphone 320 or other outgoing baseband data (such as network data, email or interactive video game data) from processor/controller 340.
  • the TX processing circuit 315 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate a processed baseband or IF signal.
  • the RF transceiver 310 receives the outgoing processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal into an RF signal transmitted via the antenna 305.
  • the processor/controller 340 can include one or more processors or other processing devices and execute an OS 361 stored in the memory 360 in order to control the overall operation of UE 116.
  • the processor/controller 340 can control the reception of forward channel signals and the transmission of backward channel signals through the RF transceiver 310, the RX processing circuit 325 and the TX processing circuit 315 according to well-known principles.
  • the processor/controller 340 includes at least one microprocessor or microcontroller.
  • the processor/controller 340 is also capable of executing other processes and programs residing in the memory 360, such as operations for channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure.
  • the processor/controller 340 can move data into or out of the memory 360 as required by an execution process.
  • the processor/controller 340 is configured to execute the application 362 based on the OS 361 or in response to signals received from the gNB or the operator.
  • the processor/controller 340 is also coupled to an I/O interface 345, where the I/O interface 345 provides UE 116 with the ability to connect to other devices such as laptop computers and handheld computers. I/O interface 345 is a communication path between these accessories and the processor/controller 340.
  • the processor/controller 340 is also coupled to the input device(s) 350 and the display 355. An operator of UE 116 can input data into UE 116 using the input device(s) 350.
  • the display 355 may be a liquid crystal display or other display capable of presenting text and/or at least limited graphics (such as from a website).
  • the memory 360 is coupled to the processor/controller 340. A part of the memory 360 can include a random access memory (RAM), while another part of the memory 360 can include a flash memory or other read-only memory (ROM).
  • FIG. 3a illustrates an example of UE 116
  • various changes can be made to FIG. 3a.
  • various components in FIG. 3a can be combined, further subdivided or omitted, and additional components can be added according to specific requirements.
  • the processor/controller 340 can be divided into a plurality of processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs).
  • FIG. 3a illustrates that the UE 116 is configured as a mobile phone or a smart phone, UEs can be configured to operate as other types of mobile or fixed devices.
  • FIG. 3b illustrates an example gNB 102 according to the present disclosure.
  • the embodiment of gNB 102 shown in FIG. 3b is for illustration only, and other gNBs of FIG. 1 can have the same or similar configuration.
  • a gNB has various configurations, and FIG. 3b does not limit the scope of the present disclosure to any specific implementation of a gNB.
  • gNB 101 and gNB 103 can include the same or similar structures as gNB 102.
  • gNB 102 includes a plurality of antennas 370a-370n, a plurality of RF transceivers 372a-372n, a transmission (TX) processing circuit 374, and a reception (RX) processing circuit 376.
  • one or more of the plurality of antennas 370a-370n include a 2D antenna array.
  • gNB 102 also includes a controller/processor 378, a memory 380, and a backhaul or network interface 382.
  • RF transceivers 372a-372n receive an incoming RF signal from antennas 370a-370n, such as a signal transmitted by UEs or other gNBs. RF transceivers 372a-372n down-convert the incoming RF signal to generate an IF or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 376, where the RX processing circuit 376 generates a processed baseband signal by filtering, decoding and/or digitizing the baseband or IF signal. RX processing circuit 376 transmits the processed baseband signal to controller/processor 378 for further processing.
  • the TX processing circuit 374 receives analog or digital data (such as voice data, network data, email or interactive video game data) from the controller/processor 378.
  • TX processing circuit 374 encodes, multiplexes and/or digitizes outgoing baseband data to generate a processed baseband or IF signal.
  • RF transceivers 372a-372n receive the outgoing processed baseband or IF signal from TX processing circuit 374 and up-convert the baseband or IF signal into an RF signal transmitted via antennas 370a-370n.
  • the controller/processor 378 can include one or more processors or other processing devices that control the overall operation of gNB 102.
  • the controller/processor 378 can control the reception of forward channel signals and the transmission of backward channel signals through the RF transceivers 372a-372n, the RX processing circuit 376 and the TX processing circuit 374 according to well-known principles.
  • the controller/processor 378 can also support additional functions, such as higher-level wireless communication functions.
  • the controller/processor 378 can perform a Blind Interference Sensing (BIS) process such as that performed through a BIS algorithm, and decode a received signal from which an interference signal is subtracted.
  • a controller/processor 378 may support any of a variety of other functions in gNB 102.
  • the controller/processor 378 includes at least one microprocessor or microcontroller.
  • the controller/processor 378 is also capable of executing programs and other processes residing in the memory 380, such as a basic OS.
  • the controller/processor 378 can also support channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure.
  • the controller/processor 378 supports communication between entities such as web RTCs.
  • the controller/processor 378 can move data into or out of the memory 380 as required by an execution process.
  • the controller/processor 378 is also coupled to the backhaul or network interface 382.
  • the backhaul or network interface 382 allows gNB 102 to communicate with other devices or systems through a backhaul connection or through a network.
  • the backhaul or network interface 382 can support communication over any suitable wired or wireless connection(s).
  • gNB 102 is implemented as a part of a cellular communication system, such as a cellular communication system supporting 5G or new radio access technology or NR, LTE or LTE-A
  • the backhaul or network interface 382 can allow gNB 102 to communicate with other gNBs through wired or wireless backhaul connections.
  • the backhaul or network interface 382 can allow gNB 102 to communicate with a larger network, such as the Internet, through a wired or wireless local area network or through a wired or wireless connection.
  • the backhaul or network interface 382 includes any suitable structure that supports communication through a wired or wireless connection, such as an Ethernet or an RF transceiver.
  • the memory 380 is coupled to the controller/processor 378.
  • a part of the memory 380 can include an RAM, while another part of the memory 380 can include a flash memory or other ROMs.
  • a plurality of instructions, such as the BIS algorithm are stored in the memory. The plurality of instructions are configured to cause the controller/processor 378 to execute the BIS process and decode the received signal after subtracting at least one interference signal determined by the BIS algorithm.
  • the transmission and reception paths of gNB 102 (implemented using RF transceivers 372a-372n, TX processing circuit 374 and/or RX processing circuit 376) support aggregated communication with FDD cells and TDD cells.
  • FIG. 3b illustrates an example of gNB 102
  • gNB 102 can include any number of each component shown in FIG. 3a.
  • the access point can include many backhaul or network interfaces 382, and the controller/processor 378 can support routing functions to route data between different network addresses.
  • gNB 102 can include multiple instances of each (such as one for each RF transceiver).
  • FIG. 4 illustrates a schematic view for a random access process based on contention between a UE and a base station in the LTE-A.
  • Transmissions in the wireless communication system includes: the transmission from the base station (gNB) to the User Equipment (UE) (called as a downlink transmission), a corresponding time slot is called as a downlink time slot; and the transmission from the UE to the base station (called as an uplink transmission), a corresponding time slot is called as an uplink time slot.
  • gNB base station
  • UE User Equipment
  • the system sends a synchronization signal and a broadcast channel to the user periodically through a synchronization signal/PBCH block (SSB), its period is called as a synchronization signal block periodicity (SSB periodicity), or a synchronization signal block group periodicity (SSB burst periodicity).
  • SSB periodicity synchronization signal block periodicity
  • SSB burst periodicity synchronization signal block group periodicity
  • the base station may configure a physical random access channel (PRACH) configuration period.
  • PRACH physical random access channel
  • RACH transmission occasions also known as random access transmission occasions or random access occasions
  • all SSBs could be mapped to the corresponding ROs within a mapping association period (a certain length of time)
  • all SSBs in an SSB periodicity could just be mapped to required random access resources in a mapping cycle from one SSB to RO, and there may be one or more mapping cycles in a mapping association period.
  • a mapping association pattern period from one SSB to RO includes one or more mapping association periods, and mapping patterns from SSB to RO in each mapping association pattern period are the same.
  • NR new radio
  • performances of the random access directly affect the user's experience.
  • LTE and LTE-advanced hereinafter referred to as LTE-A
  • the random access process is applied to multiple scenarios such as initial connection establishment, cell handover, uplink reestablishment, RRC connection reestablishment, etc., and is divided into a contention-based random access and a contention free-based random access according to whether the user monopolizes a preamble sequence resource.
  • each user selects a preamble sequence from among a same preamble sequence resource in a process of attempting to establish an uplink, therefore it may happen that multiple users choose the same preamble sequence to transmit to the base station. Therefore, a conflict resolution mechanism is an important research direction in the random access. Specifically, how to reduce a conflict probability and how to quickly solve occurred conflicts are key indicators affecting the performance of random access.
  • the contention-based random access process in the LTE/LTE-A has four steps, as illustrated in FIG. 4.
  • the UE randomly selects a preamble sequence from a preamble sequence resource pool to transmit to the base station.
  • the base station performs a correlation detection on received signals so as to identify the preamble sequence transmitted by the UE.
  • the base station transmits a Random Access Response (RAR) to the UE, which includes a random access preamble sequence identifier, a Timing Advance instruction determined according to a time delay estimation between a UE and a base station, a Cell-Radio Network Temporary Identifier (C-RNTI) and a time-frequency resource allocated for a next uplink transmission of the UE.
  • RAR Random Access Response
  • the UE transmits a third message (Msg3) to the base station according to information in the RAR.
  • the Msg3 comprises information such as an identifier of the UE, a RRC connection request and the like, wherein the identifier of the UE is unique for the UE and used to solve the conflict.
  • the base station transmits, to the UE, a conflict resolution identifier including the identifier of UE which won in the conflict resolution. If the UE detects its own identifier, it upgrades the temporary C-RNTI to a C-RNTI and transmits an ACK signal to the base station, completes the random access process and waits for being scheduled by the base station. Otherwise, the UE may start a new random access process after a delay period.
  • the base station may allocate a preamble sequence to the UE because it knows the identifier of the UE. Therefore, instead of randomly selecting a preamble sequence, the UE may use the preamble sequence allocated by the base station when the UE transmits the preamble sequence.
  • the base station may transmit a corresponding random access response including information such as the Timing Advance, uplink resource allocation and the like, after detecting the allocated preamble sequence.
  • the UE determines that uplink synchronization has been completed and waits for being further scheduled by the base station. Therefore, the contention free-based random access process comprises only two steps: transmitting the preamble sequence in the first step; and transmitting the random access response in the second step.
  • the random access process in the LTE/LTE-A is suitable for the following scenarios.
  • Uplink data arrives and the random access process is request in RRC connection state (when the uplink is in non-synchronization or there is no resource allocated to a scheduling request in PUCCH resources);
  • a system with a higher subcarrier spacing (SCS) (for example, in a system with high frequency band greater than 52.6GHz)
  • SCS subcarrier spacing
  • corresponding OFDM symbol and a slot length are shortened as increasing of the subcarrier spacing.
  • how to obtain the configuration information of the random access resource is a problem to be solved.
  • whether the signal could be transmitted may be related to a result of channel condition detection (for example, performing a listen before talk (LBT) operation on the channel, that is, monitoring the channel at first, and transmits the signal if the channel is idle; and no signal is transmitted if the channel is busy). Therefore, how to configure the random access resource and how the UE obtains and determines an available random access resource configuration is a problem to be solved.
  • LBT listen before talk
  • the present disclosure proposes a random access method applicable to a situation where the higher PRACH subcarrier spacing is used.
  • FIG. 5 illustrates a flowchart of a random access method of a UE according to an embodiment of the present disclosure.
  • the UE acquires random access resource configuration information in step 501, determines a subcarrier spacing of the random access preamble in step 502, determines a random access occasion (RO) according to the random access resource configuration information and the subcarrier spacing of the random access preamble in step 503, and transmits the random access preamble on the determined RO in step 504.
  • a random access occasion RO
  • FIG. 6 illustrates a view of an example of random access resource configuration in case that a PRACH subcarrier spacing is 120kHz, according to an embodiment of the present disclosure.
  • FIG. 7 illustrates a view of an example for acquiring a random access configuration by using a bitmap indication.
  • the random access resource configuration method according to the embodiment of the present disclosure would be further described in connection with FIGs. 6 and 7.
  • a first subcarrier spacing (e.g. 60kHz or 120kHz) may be used in a communication system operating on a lower frequency band, while in a communication system operating on a higher frequency band, a second subcarrier spacing (e.g. 240kHz, 480kHz and 960kHz) may be used in addition to the first subcarrier spacing, and a length of a corresponding time unit (e.g. an OFDM symbol, a slot) may be shortened accordingly. For example, when the subcarrier spacing is 15 kHz, the length of one slot is 1 ms, while when the subcarrier spacing is 120 kHz, the length of one slot is 0.125 ms.
  • the present disclosure provides a configuration manner of a random access resource (a RACH resource), which can be more suitable for the case in which the second subcarrier spacing is used.
  • the configuration related to random access (also known as random access configuration or random access resource configuration) that may be obtained by the UE includes at least one of the following.
  • the UE may determine a value of the subcarrier spacing of the random access preamble according to the indication. Details of the indication method may be at least one of the following.
  • ⁇ Direct indication of the value of the subcarrier spacing of the random access preamble (for example, through a higher layer signalling (such as a system message), or through physical layer information such as DCI and the like).
  • a 2-bit indication 00 represents 120khz, 01 represents 480kHz, 10 represents 960khz, and 11 is null; Or only 1 bit is used to indicate, 0 represents 480khz or 960khz.
  • an existing subcarrier spacing indication bit is redefined.
  • an indication of message 1 subcarrier spacing msg1-SubcarrierSpacing is redefined in the following manner.
  • the msg1-SubcarrierSpacing indicates 15khz or 30khz, and in a frequency range 2, the msg1-SubcarrierSpacing indicates 60khz or 120khz; in a frequency range 3 (or 4), the msg1-SubcarrierSpacing indicates 120khz or 480khz (or 120khz or 960khz; or 960khz or 480khz).
  • the UE determines that the subcarrier spacing of the random access preamble is 120khz.
  • ⁇ Indication of the value of the subcarrier spacing of the random access preamble according to a value of subcarrier spacing (uplink or downlink, or the larger one or smaller one in the uplink and the downlink) on a frequency position (for example, a BWP or a carrier) at where the UE is located. For example, if the current BWP is an initial access BWP and an uplink SCS on the initial access BWP is 120kHz, the UE determines that the subcarrier spacing of the random access preamble is also 120kHz.
  • the UE determines the value of the subcarrier spacing of the random access preamble according to the value of subcarrier spacing on the frequency position (for example, a BWP or a carrier) at where the UE is located.
  • the frequency position for example, a BWP or a carrier
  • RACH occasion RO
  • Details of the configuration mode of the RO may be at least one of the following.
  • a random access configuration when the subcarrier spacing is 120 kHz is obtained by the UE by looking up a table (according to a random access configuration table corresponding to FR2 (frequency range 2)) according to an obtained random access configuration index (prach-ConfigurationIndex) and by a corresponding rule, and an example of the random access configuration table is shown in Table 1 below.
  • the random access configuration index 3 in Table 1 corresponds to the random access configuration when the subcarrier spacing is 120 kHz, as shown in FIG. 6.
  • one PRACH frame is 10ms, which includes a total of 80 slots; among them, the slot indexes configured as PRACH slots are 8, 9, 18, 19, 28, 29, 38, 39, 48, 49, 58, 59, 68, 69, 78, 79. There are a total of 6 ROs starting from the first symbol in each PRACH slot.
  • the determined subcarrier spacing of the random access preamble is a second subcarrier spacing (e.g., 960kHz, or other values such as 240kHz, 480KHZ, etc.)
  • the random access configuration of 80 slots i.e., in the case of 120kHz
  • the 80 slots corresponding to 120kHz are used as an example, or other references, such as 40 slots corresponding to 60kHz, may also be used
  • slots may index independently in a slot group (that is, in each slot group, slots are indexed separately from 0);
  • all slots may be indexed together, that is, a slot is indexed from 0 starting from the first slot of the first slot group, and the slots in all slot groups are indexed in chronological order, as shown in FIG. 7.
  • the random access configurations of N slot groups are determined by looking up a table. For example, one row of a table with 16 rows is indicated by 4 bits, wherein one row of the table represents one combination of slot groups, as shown in Table 2 below.
  • the number of rows of the table may be changed to more or less (indicated by a greater number of bits, for example, 5 bits may indicate 32 rows; or indicated by a smaller number of bits, for example, 3 bits may indicate 8 rows).
  • the specific slot group indication of each row may be replaced as reserved (i.e., there is no special indication for the time being), or other possible one slot group or a combination of multiple slot groups, and an example table is omitted.
  • the random access configuration of N slot groups is determined according to a position indication of the first slot group having the random access resource (i.e., the start slot group index indication) and/or a number indication of slot groups having random access resource and/or a position relationship indication of different slot groups having random access resource (e.g. consecutive or with a certain space). For example, if the indicated slot group index of the first slot group with random access resource is 1, the indicated number of slot groups having random access resource is 3, and the indicated location relationship of different slot groups having random access resource is consecutive, the UE may determine that the random access resource is configured in three consecutive slot groups (slot group indexes 1, 2, 3) starting from the slot group index 1.
  • the UE may determine that random access resource is configured in the slot groups with slot group index of 1, 3 and 5.
  • the slot groups configured with random access resource it may also be deduced from back to front. For example, if the indicated slot group index of the first slot group having random access resource is 7, the indicated number of slot groups having random access resource is 3, and the indicated location relationship of different slot groups having random access resource is consecutive, the UE may determine that the random access resource is configured in three reverse consecutive slot groups (slot indexes 5, 6, 7) starting from slot group index 7.
  • the position indication of the first slot group having random access resource and/or the number indication of slot groups having random access resource and/or the position relationship indication of different slot groups having random access resource, and/or the indication of deduction direction (forward or reverse) may be obtained explicitly through a bit domain (in a higher layer signalling and/or a DCI configuration), and/or determined by default/predefined rules, and/or derived by calculation formulas.
  • it may indicate that one or more random access occasions of 960kHz in N 8 possible random access occasions of 960kHz corresponding to random access occasions ROs (time length occupied) of 120kHz (the RO time length of the 120kHz corresponds to N RO time lengths of 960kHz) is the actual random access configuration, in which 120kHz and 960kHz are only examples of subcarrier spacings. Details of the manner may be at least one of the following: all 8 random access occasions are configured ROs by default, as shown in the example in (a) in FIG. 10.
  • the RO actually configured is obtained through the ROs specifically configured by the base station. For example, by means of a bitmap, and an 8-bitmap in this example, as shown in (b) in FIG. 10, 10010010, where '1' represents the RO actually configured and '0' represents the RO not actually configured.
  • the position of the RO actually configured may be very flexible, but it takes a large signalling overhead.
  • the signalling overhead may also be reduced by determining the actually configured ROs according to whether the base station configures an odd RO index value, an even RO index value, or every nth RO.
  • the UE uses a default (fixed) number of ROs.
  • it may be indicated by looking up a table similar to table 2, that is, replacing the slot group index in Table 2 with an RO index.
  • the random access configuration in 80 slots may be determined by taking the random access configuration in the 80 slots (i.e., in the case of 120 kHz) determined according to the obtained random access configuration index as reference. At this time, it is not necessary to consider the case in which the whole RACH frame is configured as 10ms. Details of the determination manner may include at least one of the following.
  • T_rachduration may also be called as a RACH frame time length T_rachframe.
  • T_rachduration may be configured separately, or may be configured differently by changing a length T_SF of a system frame (i.e., given T_rachduration is the same as the length of the system frame).
  • a value range of T_rachduration may be one or more of ⁇ 1.25, 2.5, 5, 10 ⁇ ms, and/or obtained by multiplying a scaling factor by the time length of the system frame.
  • the configured scaling factor may be one or more of ⁇ 1/8, 1/4, 1/2 ⁇ .
  • ⁇ Determined by the configured random access resource allocation period T_rachperiodicity For example, it may be indicated by separately adding an indication of the random access resource configuration period, or it may be determined by applying the configured scaling factor and/or offset to the existing random access resource configuration period.
  • the UE may determine the specific location of the configured random access resource in one RACH configuration period by an indication of the location of the configured random access resource. Details of the determination manner may be at least one of the following.
  • T_rachperiodicity 5ms and the system frame is still 10ms, that is, when the length of system frame is greater than T_rachperiodicity (and/or a positive integer multiple of T_rachperiodicity), it indicates that there are RACH resources in each system frame.
  • the specific position of the duration occupied by the configured RACH in one RACH configuration period may be determined by configuring a value of N_rachduration_index, where N_rachduration_index is an index value of the position of the duration occupied by one RACH in one RACH configuration period, and its value range is ⁇ 0, 1...T_rachperiodicity/T_rachduration ⁇ .
  • N_rachperiodicity 5ms
  • T_ rachduration 1.25ms
  • the value range of N_rachduration_index is ⁇ 0, 1, 2... 3 ⁇ .
  • the N_rachduration_index may be indicated by the bitmap described above, or obtained by looking up a table. The method is the same and details are omitted.
  • the system frame where the configured RACH resource is located may be determined according to the above method at first, and then the specific location of the duration occupied by the RACH resource in the system frame bearing the random access resource is obtained according to the configured N_rachduration_index, that is, the N_rachduration_index in the above method is the index value of the position of the duration occupied by the RACH on the system frame bearing the random access resource, and its value range is ⁇ 0, 1...T_SF/T_rachduration ⁇ .
  • reuse of the random access resource index in the random access resource configuration information saves the signaling overhead and assists the UE to quickly determine the random access resource in the case of a high subcarrier spacing.
  • the random access configuration is reused to the greatest extent, there is no need to redesign the random access resource configuration information table.
  • RO may be indicated in at least one of the following ways.
  • the index of available ROs in one slot are notified through a bit domain (in a higher layer signalling and/or DCI configuration).
  • the available RO is configured as a RO with odd index, or a RO with even index, or every nth RO; n is a positive integer.
  • the bitmap is used to inform which ROs in one slot are available. 1 represents available and 0 represents unavailable. For example, when there are 6 ROs in one slot, by indicating with the bitmap of 6 bits 010101, the UE may determine that ROs with index 1, 3 and 5 are available ROs.
  • the number of bits required by the bitmap is determined by a preamble format and/or a bit number indication required by the bitmap (e.g., 0 or 1), as shown in Table 3. For example, when the preamble format is A1 and the required number of bits is indicated as 0, the UE determines that the required number of bits for the bitmap is 6.
  • the UE determines that the value of the required bit number is 1; Preferably, for a preamble format of a long sequence and a B4 format, the UE determines that the value of required bit number is 1; Preferably, the required bit number may also be represented by 'number of ROs in one PRACH slot' in a row corresponding to the random access resource configuration index in the random access resource configuration table (e.g., Table 1).
  • the UE may determine the available ROs according to the configured available RO gap value. For example, in a case where the configured available RO gap value is 2 OFDM symbols, and there are 6 consecutive ROs in one slot and each RO occupies 2 OFDM symbols (e.g. PRACH format A1/B1), the next RO spaced by at least 2 OFDM symbols from the first RO (end position) is an available RO, that is, the third RO, and the RO spaced at least 2 OFDM symbols from the third RO (end position) is a next available RO, that is, the fifth RO, and so on.
  • the configured available RO gap value is 2 OFDM symbols, and there are 6 consecutive ROs in one slot and each RO occupies 2 OFDM symbols (e.g. PRACH format A1/B1)
  • the next RO spaced by at least 2 OFDM symbols from the first RO (end position) is an available RO, that is, the third RO
  • the RO spaced at least 2 OFDM symbols from the third RO (end position) is a next available RO, that is, the fifth RO, and so on
  • the configured available RO gap value indication may be explicitly notified by the base station to the UE through the bit domain, or may be calculated by the UE through a formula [T_LBT/T_OFDMsymbol] based on a time T_LBT required for the LBT, where T_OFDMsymbol is a time of one OFDM symbol, [ ] is a ceiling operation or a floor operation on a number within [ ].
  • a calculated starting position i.e., the first available RO
  • the period of time may be at least one of the following:
  • the ROs configured in each of the plurality of slot groups are the same.
  • the RO indication modes in the above methods may be applied to the ROs in one slot, or may be applied to the ROs to which each downlink signal is mapped after completing a mapping between the downlink signals (such as SSB, CSI-RS) and the ROs.
  • the downlink signals such as SSB, CSI-RS
  • ⁇ it may also be determined that there is an enough gap value between two available ROs by deciding the validity of the configured ROs. Details of the determination manner may be at least one of the following.
  • a configured gap value of valid ROs Indicated by a configured gap value of valid ROs.
  • the UE may determine that the configured RO is valid. For example, in a case where the configured gap value of the valid ROs is 2 OFDM symbols, there are 6 consecutive ROs in one slot, and each RO occupies 2 OFDM symbols (e.g.
  • the PRACH format A1/B1 if the spacing between the first RO (end position) and the second RO in the current slot is less than 2 OFDM symbols, the second RO is an invalid RO, the third RO is a valid RO, and the RO spaced by at least 2 OFDM symbols from the third RO (end position) is the next valid RO, that is, the fifth RO, and so on.
  • an indication of the configured gap value of the valid ROs may be explicitly notified to the UE by the base station through the bit domain, or may be calculated by the UE through a formula [T_LBT/T_OFDMsymbol] based on a time T_LBT required for the LBT, where T_OFDMsymbol is a time of one OFDM symbol, [ ] is a ceiling operation or a floor operation on a number within [ ].
  • the UE determines that the RO is a valid RO, otherwise, it is an invalid RO.
  • a deciding start position (i.e., the first valid RO) of the valid ROs may be a first available RO in a period of time, and the period of time may be at least one of the following.
  • the availability may be decided first and then the validity is decided, or on the contrary, the validity is decided first and then the availability is decided.
  • RA-RNTI For a configured RACH resource in the case that a higher SCS is used, a calculation method of RA-RNTI may be one of the following.
  • RA-RNTI 1 + s_id + 14 ⁇ t_id + 14 ⁇ 80 ⁇ f_id + 14 ⁇ 80 ⁇ 8 ⁇ slotgroup_id + 14 ⁇ 80 ⁇ 8 ⁇ 8 ⁇ ul_carrier_id, where s_ id is the first OFDM symbol index of the selected RO (0 ⁇ s_id ⁇ 14), t_id is the index of the slot in the slot group where the selected RO is located (0 ⁇ t_id ⁇ 80), f_id is the index value of the selected RO in the frequency domain (0 ⁇ f_id ⁇ 8), slotgroup_ id is the index of the slot group where the selected RO is located (0 ⁇ slotgroup_id ⁇ 8), and ul_carrier_id is the index of the carrier for random access (0 represents the normal uplink carrier and
  • RA-RNTI 1 + s_id + 14 ⁇ t_id + 14 ⁇ 640 ⁇ f_id + 14 ⁇ 640 ⁇ 8 ⁇ ul_carrier_id, where s_ id is the first OFDM symbol index of the selected RO (0 ⁇ s_id ⁇ 14), t_id is the index of the slot where the selected RO is located (0 ⁇ t_id ⁇ 640), f_id is the index value of the selected RO in the frequency domain (0 ⁇ f_id ⁇ 8), and ul_carrier_id is the index of the carrier for random access (0 represents the normal uplink carrier and 1 is the supplementary uplink carrier).
  • the calculation method of MSGB-RNTI may be one of the following.
  • ⁇ MSGB-RNTI 1 + s_id + 14 ⁇ t_id + 14 ⁇ 80 ⁇ f_id + 14 ⁇ 80 ⁇ 8 ⁇ slotgroup_id+ 14 ⁇ 80 ⁇ 8 ⁇ 8 ⁇ ul_carrier_id+ 14 ⁇ 80 ⁇ 8 ⁇ 8 ⁇ 2, where s_ id is the first OFDM symbol index of the selected RO (0 ⁇ s_id ⁇ 14), t_id is the index of the slot in the slot group where the selected RO is located (0 ⁇ t_id ⁇ 80), f_id is the index of the selected RO in the frequency domain (0 ⁇ f_id ⁇ 8), slotgroup_ id is the index of the slot group where the selected RO is located (0 ⁇ slotgroup_id ⁇ 8), and ul_carrier_id is the index of the carrier for random access (0 represents the normal uplink carrier and 1 is the supplementary uplink carrier).
  • MSGB-RNTI 1 + s_id + 14 ⁇ t_id + 14 ⁇ 640 ⁇ f_id + 14 ⁇ 640 ⁇ 8 ⁇ ul_carrier_id + 14 ⁇ 80 ⁇ 8 ⁇ 8 ⁇ 2, where s_ id is the first OFDM symbol index of the selected RO (0 ⁇ s_id ⁇ 14), t_id is the index of the slot where the selected RO is located (0 ⁇ t_id ⁇ 640), f_id is the index value of the selected RO in the frequency domain (0 ⁇ f_id ⁇ 8), and ul_carrier_id is the index of the carrier for random access (0 represents the normal uplink carrier and 1 is the supplementary uplink carrier).
  • a user equipment when applied to small data transmission, coverage enhancement, reduced capability (reducap), or other purposes or scenarios, may receive a random access configuration applied to one or more of the above purposes or scenarios and thus determine the random access resource for the scenario or purpose so as to transmit an uplink signal.
  • the method is described by taking the small data transmission as an example, which may be extended to other scenarios and purposes.
  • the random access configuration may include a combination of one or more of the following (interchangeable).
  • Random access occasion including the combination of one or more of the following (interchangeable):
  • UE uses the pattern of SSB on the initial BWP to perform a judgment of validity of a RO and a mapping association for a subsequent SSB-RO when performing association of an SSB-RO.
  • RACH preamble A configuration of random access preamble (RACH preamble) including the combination of one or more of the following (interchangeable).
  • the preambles for SDT are N_premable preambles starting from preamble 24;
  • the number of starting points may be limited, for example, there are values of only 4 starting points, and may be indicated by using only 2 bits; and / or
  • a default start position is derived, from back to front, from the end position of the preamble part of each SSB in each RO, i.e., N_premable preambles.
  • N_premable preambles As shown in FIG. 11, assuming that there are 64 preambles on one RO and two SSBs are mapped and associated on one RO, namely, SSB 0 and SSB 1. Then for SSB 0, the starting point of the preambles of 4step RACH is 0 and the number is 8; the starting point of the preambles of 2step RACH is the end point of 4step RACH, that is, preamble index 8, and the number is 8.
  • the SDT preambles corresponding to SSB 1 may be derived, from back to front, from the end corresponding to SSB1, that is, the preamble index 63, resulting in the preamble indexes 56 ⁇ 63. This method will lose some flexibility compared with the previous explicit indication method, but it can reduce the signaling overhead.
  • ⁇ PUSCH configuration information including the combination of one or more of the following items (interchangeable):
  • the SDT has a separate BWP, i.e., SDT-specific BWP
  • UE uses the pattern of SSB on the initial BWP to perform a judgment of validity of a RO and a mapping association for a subsequent SSB-RO when performing an association of an SSB-RO.
  • FIG. 8 illustrates a user equipment 800 according to an embodiment of the present disclosure.
  • the user equipment includes a memory 801 and a processor 802.
  • the memory stores computer executable instructions. When the instructions are executed by the processor, at least one method corresponding to the above embodiments of the present disclosure is executed.
  • FIG. 9 illustrates a base station 900 according to an embodiment of the present disclosure.
  • the base station includes a memory 901 and a processor 902.
  • the memory stores computer executable instructions. When the instructions are executed by the processor, at least one method corresponding to the above embodiments of the present disclosure is executed.
  • the present disclosure also provides a computer-readable medium on which computer executable instructions are stored. When the instructions are executed, any method described in the embodiment of the present disclosure is executed.
  • the processor may be configured to transmit configuration information to the user equipment side (the configuration information is described above and details are omitted herein); to detect a possible random access preamble signal on the configured random access occasion; or the base station or network equipment detects the uplink signal transmitted by the user equipment on the configured uplink transmission resources.
  • User equipment or “UE” herein may refer to any terminal with wireless communication capability, including but not limited to mobile phones, cellular phones, smart phones or personal digital assistants (PDAs), portable computers, image capture devices such as digital cameras, game devices, music storage and playback devices, and any portable unit or terminal with wireless communication capability, or internet facilities that allow wireless internet access and browsing.
  • PDAs personal digital assistants
  • portable computers image capture devices such as digital cameras, game devices, music storage and playback devices, and any portable unit or terminal with wireless communication capability, or internet facilities that allow wireless internet access and browsing.
  • base station or “network equipment” used herein can refer to eNB, eNodeB, NodeB or base station transceiver (BTS) or gNB according to the technology and terminology used.
  • BTS base station transceiver
  • the "memory” herein may be any type suitable for the technical environment herein and may be implemented using any suitable data storage technology, including but not limited to semiconductor based storage devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the processor here may be any type suitable for the technical environment herein, including but not limited to one or more of the following: general-purpose computer, special-purpose computer, microprocessor, digital signal processor DSP and processor based on multi-core processor architecture.
  • the present disclosure includes devices for performing one or more of the operations described in the present application. These devices may be specially designed and manufactured for the desired purpose, or may include known devices in a general-purpose computer. These devices have computer programs stored therein, which are selectively activated or reconstructed.
  • Such computer programs may be stored in a device (e.g., computer) readable medium or in any type of medium suitable for storing electronic instructions and respectively coupled to the bus, including but not limited to any type of disk (including soft disk, hard disk, optical disk, CD-ROM, and magneto-optical disk), ROM (Read Only Memory), RAM (Random Access Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), flash memory, magnetic card or light card.
  • a readable medium includes any medium in which information is stored or transmitted in a readable form by a device (E. G., a computer).
  • each frame in these structure diagrams and/or block diagrams and/or flow diagrams and the combination of frames in these structure diagrams and/or block diagrams and/or flow diagrams can be realized by computer program instructions.
  • these computer program instructions can be provided to a general-purpose computer, a professional computer or a processor of other programmable data processing methods to implement the scheme specified in the block or multiple blocks of the structure diagram and/or block diagram and/or flow diagram disclosed by the present disclosure through a computer or a processor of other programmable data processing methods.
  • steps, measures and schemes in various operations, methods and processes discussed in the disclosure can be alternately changed, combined or deleted. Further, other steps, measures and schemes in various operations, methods and processes discussed in the present disclosure can also be alternately, changed, rearranged, decomposed, combined or deleted. Further, the steps, measures and schemes in the prior art with various operations, methods and processes disclosed in the disclosure can also be alternately, changed, rearranged, decomposed, combined or deleted.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé d'accès aléatoire pour un équipement utilisateur (UE) et un appareil associé, et un procédé d'accès aléatoire pour une station de base et un appareil associé. Le procédé d'accès aléatoire pour l'équipement utilisateur (UE) consiste à : acquérir des informations de configuration de ressource d'accès aléatoire ; déterminer un espacement de sous-porteuse d'un préambule d'accès aléatoire ; déterminer une opportunité d'accès aléatoire (RO) d'après les informations de configuration de ressource d'accès aléatoire et l'espacement de sous-porteuse du préambule d'accès aléatoire ; et transmettre le préambule d'accès aléatoire sur la RO déterminée.
PCT/KR2022/000560 2021-01-12 2022-01-12 Équipement utilisateur pour accès aléatoire et procédé associé, station de base pour accès aléatoire et procédé associé WO2022154477A1 (fr)

Priority Applications (2)

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KR1020237021506A KR20230129400A9 (ko) 2021-01-12 2022-01-12 랜덤 액세스를 위한 사용자 장치 및 방법, 랜덤 액세스를 위한 기지국 및 방법
EP22739672.8A EP4256887A4 (fr) 2021-01-12 2022-01-12 Équipement utilisateur pour accès aléatoire et procédé associé, station de base pour accès aléatoire et procédé associé

Applications Claiming Priority (6)

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CN202110036163.5 2021-01-12
CN202110036163 2021-01-12
CN202110272001.1 2021-03-12
CN202110272001 2021-03-12
CN202110893364.7A CN114765883A (zh) 2021-01-12 2021-08-04 用户设备及其随机接入方法和基站及其随机接入方法
CN202110893364.7 2021-08-04

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WO2024093323A1 (fr) * 2023-06-30 2024-05-10 Lenovo (Beijing) Limited Détermination de groupes d'occasions rach

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EP4256887A1 (fr) 2023-10-11
EP4256887A4 (fr) 2024-06-05

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